package com.sky.service.impl;


import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {


    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;
    /**
     * 获取订单营业额
     * @param begin
     * @param end
     **/
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //需要返回的数据有日期和当日的营业额。将日期以字符串的形式返回，及每个日期中间用','隔开同理营业额也是这样操作
        //首先根据传入参数begin,end来获得日期
        List<LocalDate> dates = new ArrayList();
        dates.add(begin);
        while(!begin.equals(end)) {
            begin = begin.plusDays(1);
            dates.add(begin);
        }

        //通过查询数据库来获得对应日期的营业额
        List<Double> turnoverList = new ArrayList<>();
        dates.forEach(date->{
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //查询数据库，将订单日期在此范围内的金额总数统计出来
            Double turnover = orderMapper.countTurnover(beginTime,endTime);
            turnoverList.add(turnover);
        });

        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dates, ", "))
                .turnoverList(StringUtils.join(turnoverList, ", "))
                .build();
    }

    /**
     * 统计用户
     * @param begin
     * @param end
     **/
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //统计用户，需要统计三个部分，日期，当前日期用户总量，当前日期新增用户
        List<LocalDate> dates = new ArrayList();
        //日期
        dates.add(begin);
        while(!begin.equals(end)) {
            begin = begin.plusDays(1);
            dates.add(begin);
        }
        List<Integer> newUserList = new ArrayList<>(); //新增用户数
        List<Integer> totalUserList = new ArrayList<>(); //总用户数

        for (LocalDate date : dates) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //新增用户数量 select count(id) from user where create_time > ? and create_time < ?
            Integer newUser = getUserCount(beginTime, endTime);
            //总用户数量 select count(id) from user where  create_time < ?
            Integer totalUser = getUserCount(null, endTime);

            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dates,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }
    /**
     * 根据时间区间统计用户数量
     * @param beginTime
     * @param endTime
     * @return
     */
    private Integer getUserCount(LocalDateTime beginTime, LocalDateTime endTime) {
        Map map = new HashMap();
        map.put("begin",beginTime);
        map.put("end", endTime);
        return userMapper.countByMap(map);
    }

    /**
     * 统计订单
     * @param begin
     * @param end
     **/
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //需要统计的有日期列表，订单完成率，订单数列表，订单总数，有效订单数，有效订单数列表
        //日期列表
        List<LocalDate> dates = new ArrayList();
        dates.add(begin);
        while(!begin.equals(end)) {
            begin = begin.plusDays(1);
            dates.add(begin);
        }
        //订单总数和有效订单数
        Integer orderSum = 0;
        Integer trueOrderSum = 0;
        //订单数列表
        List<Integer> orderList = new ArrayList<>();
        //有效订单数列表
        List<Integer> TrueOrderList = new ArrayList<>();
        for(LocalDate date : dates) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer order = orderMapper.countOrders(beginTime,endTime,null);
            Integer trueOrder = orderMapper.countOrders(beginTime,endTime, Orders.COMPLETED);
            orderSum += order;
            trueOrderSum += trueOrder;
            orderList.add(order);
            TrueOrderList.add(trueOrder);
        }
        //订单完成率
        Double orderCompletionRate = trueOrderSum.doubleValue()/orderSum;
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dates, ","))
                .orderCountList(StringUtils.join(orderList, ","))
                .validOrderCountList(StringUtils.join(TrueOrderList, ","))
                .totalOrderCount(orderSum)
                .validOrderCount(trueOrderSum)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 获得销量TOP10菜品数据
     * @param begin
     * @param end
     **/
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        //需要获取的有商品名称和对应商品销量
        //首先根据日期时间查找所有订单
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime, endTime);
        //根据订单查找所有菜品，让菜品按照下单数量排序
        String nameList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList()),",");
        String numberList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList()),",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }
    /**导出近30天的运营数据报表
     * @param response
     **/
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);
        //查询概览运营数据，提供给Excel模板文件
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(begin,LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            //基于提供好的模板文件创建一个新的Excel表格对象
            XSSFWorkbook excel = new XSSFWorkbook(inputStream);
            //获得Excel文件中的一个Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            sheet.getRow(1).getCell(1).setCellValue(begin + "至" + end);
            //获得第4行
            XSSFRow row = sheet.getRow(3);
            //获取单元格
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());
            for (int i = 0; i < 30; i++) {
                LocalDate date = begin.plusDays(i);
                //准备明细数据
                businessData = workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }
            //通过输出流将文件下载到客户端浏览器中
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //关闭资源
            out.flush();
            out.close();
            excel.close();

        }catch (IOException e){
            e.printStackTrace();
        }
    }
}
